Trial inserter and trial head

ABSTRACT

Embodiments are directed to spinal treatments and, more particularly, to a trial inserter tool compatible with detachable trial heads for use in spinal surgery. In a preferred embodiment, the present invention provides a system for sizing an implant to be used in posterior lumbar interbody fusion surgery. The system may comprise a trial inserter tool, wherein the trial inserter tool comprises: a body, wherein the body is an elongated tubular, wherein the body comprises a first end and a second end; an actuation device, wherein the actuation device is disposed on the body between the first end and the second end; and a hooked support member that extends from the second end of the body; and a trial head disposable on the hooked support member.

BACKGROUND

Spinal fusion surgery may be a common procedure performed to relieve thepain and pressure on the spinal cord that may result from a number ofdifferent factors. Generally, spinal fusion may be performed todecompress and stabilize the spine. Spinal fusion generally may entailfusing adjacent vertebrae joints together. The most common drive toperform the surgery may be if a patient experiences degenerative discdisease to the point where the disc wears down and the joint between thevertebrae rubs. Generally, to fuse the adjacent vertebral bodies, theintervertebral disc may be first partially or fully removed. Bone graftmay then be inserted between neighboring vertebrae to maintain normaldisc spacing and restore spinal stability while facilitating anintervertebral fusion.

There are a number of known conventional fusion devices andmethodologies in the art for accomplishing spinal fusion. These mayinclude screw and rod arrangements, solid bone implants, and fusiondevices which may include a cage or other implant mechanisms which,typically, may be packed with bone and/or bone growth inducingsubstances. These devices may be implanted between adjacent vertebralbodies in order to fuse the vertebral bodies together, alleviating theassociated pain.

To properly size the implant mechanisms, trials may be used iteratively.For instance, traditional methods may include wherein an operator(typically a surgeon or other medical professional) inserts a trial inthe disc space between adjacent vertebral bodies. The trial may modelsimilar dimensions as the desired implant mechanism. The operator mayinsert a given number of trials into the disc space until theappropriate height and alignment has been reached. The size of thattrial may embody the size of the implant mechanism to be used.

In the past, trials may have been fixed to an insertion tool. This maypresent unnecessary problems in preparation for, during, and/or after asurgery. For example, additional sterilization time may be required foreach individual insertion tool that is fixed to a trial. Additionally,sorting through a large number of insertion tools to locate the desiredtrial may waste crucial time during a surgical procedure.

SUMMARY

In an exemplary embodiment, the present invention provides a system forsizing an implant. The system may include a trial inserter tool. Thetrial inserter tool may include a body, wherein the body is elongated,wherein the body includes a first end and a second end. The trialinserter may further include an actuation device, wherein the actuationdevice is disposed on the body between the first end and the second end.The system may further include a hooked support member that extends fromthe second end of the body. The system may further include a trial headreleasably attachable to the hooked support member.

In another exemplary embodiment, the present invention provides a systemfor sizing an implant. The system may include a trial inserter tool. Thetrial inserter tool may include a body, wherein the body is an elongatedtubular, wherein the body includes a first end and a second end, whereina hole is disposed in the body between the first end and the second end.The trial inserter tool may further include a plunger disposed in thebody, wherein the plunger is axially translatable in the body from aretracted position to an extended position with a distal end of theplunger extending from the second end of the body. The trial insertertool may further include an actuation device coupled to the plunger andoperable to move the plunger from the extended position to the retracedposition, wherein the actuation device includes a sleeve and a button,wherein the sleeve is disposed around the body and positioned betweenthe first end and the second end at the hole, wherein the sleeve isaxially displaced in response to actuation of the button, wherein axialdisplacement of the sleeve is limited by the hole in the body isactuable to release an axis of motion for the sleeve. The system mayfurther include a hooked support member that extends from the second endof the body, wherein the hooked support member includes an end extensionthat longitudinally extends from the second of the body and a mainprotrusion that protrudes from a distal end of the end extension towardsa central axis of the trial inserter tool. The system may furtherinclude a trial head releasably attachable to the hooked support member.The trial head may include a head body. The trial head may furtherinclude a channel for receiving the end extension, wherein channel isformed in an outer surface of the head body and extends longitudinallyfrom a first end of the head body. The trial head may further include ahead hole for receiving the main protrusion and disposed in the channelat an end of the channel opposite the first end. The trial head mayfurther include a recess disposed in the first end for receiving theplunger in the extended position to lock the trial head onto the trialinserter tool. The trial head may further include a marker disposed inthe head body, wherein the marker is radioactive.

In another exemplary embodiment, the present invention provides a trialinserter tool. The trial inserter tool may include a body, wherein thebody is elongated, wherein the body includes a first end and a secondend. The trial inserter tool may further include an actuation device,wherein the actuation device is disposed on the body between the firstend and the second end. The trial inserter tool may further include aplunger, wherein the plunger is disposed within the body. The trialinserter tool may further include a hooked support member, wherein thehook is disposed at the second end, wherein the hooked support member isoperable to support a trial head on the trial inserter tool.

BRIEF DESCRIPTION OF THE DRAWINGS

These drawings illustrate certain aspects of some examples of thepresent invention, and should not be used to limit or define theinvention, wherein:

FIGS. 1A and 1B illustrate an embodiment of a trial inserter tool;

FIG. 2 illustrates an embodiment of a second end of a trial insertertool;

FIG. 3 illustrates an embodiment of a trial head;

FIG. 4 illustrates an embodiment of a first end of a trial insertertool; and

FIG. 5 illustrates an embodiment of a handle.

DETAILED DESCRIPTION

Embodiments are directed to spinal treatments and, more particularly, toa trial inserter tool for use in spinal surgery that includes detachabletrial heads. Embodiments of the trial inserter tool may includeoperation of a linear actuator to enable both attachment and detachmentof a trial head. The trial inserter tool, combined with a trial head,may be inserted into a patient to size an implant to be disposed betweena given set of vertebral bodies.

Embodiments of the trial inserter tool with detachable trial heads maybe used in a wide variety of spinal treatments, including spinal fusionsurgery. Without limitation, embodiments of use may be directed towardsposterior lumbar interbody fusion (PLIF). In embodiments, PLIF surgerymay be employed to eliminate pain experienced from degenerative discdisease and/or to correct spondylolisthesis. One aspect of PLIF surgerymay be the sizing of an implant to be disposed in the intervertebraldisc space that promotes the fusion of two adjacent vertebrae. Sizingmay be done through the use of trial heads and a trial inserter tool.

A medical professional (e.g., a surgeon) may first prepare for the areato be treated. The medical professional may create an incision in theback of a patient and adjust the lower back muscles to access thedesired area. Once the disc space is cleaned out of nucleus material,the medical professional may begin determining the proper size of animplant to be used by inserting a trial head with a trial inserter toolinto the disc space. Typically, the trial head may model the exactdimensions of a specific implant. A plurality of trial heads may beinserted into the disc space before determining the correct size. Assuch, the plurality of trial heads may be detachable from the trialinserter tool, and a singular trial inserter tool may be used during thesurgical procedure.

FIGS. 1A and 1B illustrate an embodiment of a trial inserter tool 100.FIG. 1A illustrates trial inserter tool 100 in an extended position forlocking a trial head (e.g., trial head 300 on FIG. 3) onto trialinserter tool. FIG. 1B illustrates trial inserter tool 100 in aretracted position for releasing the trial head. Trial inserter tool 100may be used to insert a trial head (discussed further below) into anintervertebral disc space between a given set of vertebral bodies duringa surgical operation of a patient. In the illustrated embodiment, trialinserter tool 100 may include a body 105, an actuation device 110, and ahooked support member 115. The hooked support member 115 may support andposition and trial head on the trial insert tool 100. The actuationdevice 110 may be operable to secure the trial head on the hookedsupport member 115. In operation, the body 105 may be elongated todeliver the trial head through an access channel and into the discspace.

In some embodiments, body 105 may include a first end 120 and a secondend 125. In some embodiments, both first end 120 and second end 125 mayclose off the interior of body 105. Body 105 may be made of any suitablematerial. Without limitation, suitable materials may include metals,nonmetals, polymers, composites, ceramics, and/or combinations thereof.Body 105 may be any suitable size, height, and/or shape. Withoutlimitation, a suitable shape may include, but is not limited to,cross-sectional shapes that are circular, elliptical, triangular,rectangular, square, hexagonal, and/or combinations thereof. Inembodiments, body 105 may be a hollow, elongated tubular. In someembodiments, body 105 may have length in a range of from about 10centimeters to about 100 centimeters. In some embodiments body 105 mayhave a width of about 5 centimeters to about 30 centimeters. However,the scope of the disclosure is not so limited to these dimensions forbody 105. Rather, body 105 may have any suitable dimensions as desiredfor a particular application.

In some embodiments, trial inserter tool 100 may further includeactuation device 110. Actuation device 110 may be secured onto body 105.In the illustrated embodiment, actuation device 110 may be disposed onbody 105 between first end 120 and second end 125. Actuation device 110may be operable to secure a trial head in place at second end 125. Insome embodiments, actuation device 110 may include of a sleeve 130 and abutton 135. Sleeve 130 may be made of any suitable material. Withoutlimitation, suitable material may be metals, nonmetals, polymers,composites, ceramics, and/or combinations thereof. Sleeve 130 may be anysuitable size, height, and/or shape. Without limitation, a suitableshape may include, but is not limited to, cross-sectional shapes thatare circular, elliptical, triangular, rectangular, square, hexagonal,and/or combinations thereof. In embodiments, sleeve 130 may be a hollowtubular disposed around body 105. Sleeve 130 may have a shorter lengththan body 105. For example. Sleeve 13 may have a length of about 1centimeters to about 15 centimeters.

In some embodiments, button 135 may be disposed on sleeve 130 at anysuitable location. Button 135 may be any suitable size, height, and/orshape. In some embodiments, sleeve 130 may be displaced axially alongbody 105 by actuating button 135. For example, sleeve 130 may be securedonto body 105 at a fixed location. During operation, embodiments mayinclude pressing or otherwise actuating button 135 in order to free anaxis of motion for sleeve 130. As button 135 is actuated, sleeve 130 maybe capable of displacing axially along body 105 a certain distance. Inembodiments, the certain distance that sleeve 130 may be capable oftraversing may be defined as the length of a hole 140 disposed throughbody 105. The distance that button 135 and sleeve 130 may travel may belimited by hole 140, as either button 135 and/or sleeve 130 may becoupled to a plunger 145 (e.g., shown on FIG. 1A) disposed inside trialinserter tool 100. For example, FIG. 1A illustrates trial inserter tool100 in an extended position for securing a trial head onto hookedsupport member 115. When desired to release the trial head, for example,the button 135 may be depressed and sleeve 130 may then be axiallydisplaced toward first end 120, as seen in FIG. 1B.

With specific reference to FIG. 1A, embodiments may include plunger 145may disposed within body 105 of trial inserter tool 100. Plunger 145 mayextend through body 105 to engage actuation device 110. As illustrated,a distal end 150 of plunger 145 may extend from second end 125 of body105 in the extended position. Plunger 145 may be any suitable structureto be used as a linear actuator. Plunger 145 may be made of any suitablematerial and may be any suitable size, height, and/or shape. Inembodiments, a medical professional may manually operate plunger 145 byactuating button 135 and displacing sleeve 130. In other embodiments,plunger 145 may be driven by hydraulics, pneumatics, electricity, and/orcombinations thereof. In response to displacing sleeve 130, plunger 145may travel axially through body 105 and partially out of body 105 atsecond end 125, as seen on FIG. 1A. The portion of plunger 145 thatprotrudes from second end 125 may be the same length as the length ofhole 140. As best seen on FIG. 1B, plunger 145 may be fully retractedinto body 105 in the retracted position.

FIG. 2 illustrates second end 125 of body 105 in more detail inaccordance with example embodiments. As illustrated, plunger 145 mayextend from second end 125, and second end 125 may also include aplurality of surface features 200. The plurality of surface features 200may be used to accurately determine the length of a suitable implant tobe used in a corresponding spinal surgery. In embodiments, the surfacefeatures 200 may be seen using fluoroscopy. Surface features 200 mayinclude any suitable features on surface of second end 125 that may bevisible through fluoroscopy of other suitable technique. For example,surface features 200 may include a plurality of spaced ridges 205. Inthe illustrated embodiment, there may be a plurality of grooves 210disposed between adjacent ridges 205. In embodiments, the pluralities ofridges 205 may be have a pre-defined spacing. Without limitation, thepre-defined spacing of each ridge 205 may be from about 0.1 cm to about5 cm.

As illustrated, hooked support member 115 may be disposed at second end125 of body 105. In the illustrated embodiment, hooked support member115 extends longitudinally from second end 125. Hooked support member115 may serve to couple a trial head (e.g., trial head 300 shown on FIG.3) to trial inserter tool 100 with the actuation of plunger 145. Hookedsupport member 115 may include an end extension 215 and a mainprotrusion 220. End extension 215 may be a further axial extension ofmaterial from body 105 at second end 125. End extension 215 and secondend 125 may be unitary members or, in some embodiments, end extension215 may be a separate piece coupled to second end 125. The inner side ofend extension 215 may be chamfered and/or may include fillets. Forexample, end extension 215 may include chamfered inner surfaces 225.Main protrusion 220 may be a protrusion at a distal end 230 of endextension 215. As illustrated, main protrusion 220 may extend from endextension 215 toward central axis of trial inserter tool 100. In someembodiments, main protrusion 220 and end extension 215 may beperpendicular to each other. Main protrusion 220 may be any suitablesize, height, and/or shape. Without limitation, a suitable shape mayinclude, but is not limited to, cross-sectional shapes that arecircular, elliptical, triangular, rectangular, square, hexagonal, and/orcombinations thereof. In some embodiments, main protrusion 220 may becylindrical. In some embodiments, the dimensions of hooked supportmember 115 and plunger 145 may align with those of a trial head, asdiscussed below.

FIG. 3 illustrates an embodiment of a trial head 300. Trial head 300 maybe used to determine an appropriate width, height, length, and/orcombinations thereof of a suitable implant to be disposed within apatient during a spinal surgery. Trial head 300 may be releasablyattached to (e.g., referring to FIG. 1). In some embodiments, trial head300 may be releasably attached to trial inserter tool 100 (e.g.,referring to FIG. 1) to allow a medical professional to dispose trialhead 300 into a disc space between a set of adjacent vertebral bodies.Trial head 300 may include a head body 305, a channel 310, a head hole315, a recess 320, and a marker 325. Head body 305 may be made of anysuitable material. Without limitation, suitable material may includemetals, nonmetals, polymers, composites, ceramics, and/or combinationsthereof. Head body 305 may be any suitable size, height, and/or shape.Without limitation, a suitable shape may include, but is not limited to,cross-sectional shapes that are circular, elliptical, triangular,rectangular, square, hexagonal, and/or combinations thereof. Inembodiments, head body 305 may generally be an ovular shape.

As illustrated, trial head 300 may include an outer surface 308 in whichchannel may be disposed. Channel 310 may be a designated area of trialhead 300 wherein material from head body 305 has been removed. Asillustrated, channel 310 may extend along longitudinal axis of trialhead 300. Channel 310 may include a base 330 and walls 335. In someembodiments, base 330 may be a part of head body 305 and may be a flatside of channel 310. In some embodiments, channel 310 may include twowalls 335 that extend perpendicularly from base 330. As a result,channel 310 may generally be a rectangular space where head body 305lacks material. In some embodiments, there may be fillets where walls335 and base 330 join and/or walls 335 and base 330 may be chamfered.The length of channel 310 may traverse from a first end 340 of head body305 to head hole 315.

Head hole 315 may be a hole disposed through head body 305 near in acentral portion of head body 305. Head hole 315 may be disposed at anend 316 of channel 310 opposite from first end 340. Head hole 315 may beany suitable size and/or shape for receiving main protrusion 220 (e.g.,referring to FIG. 2). Without limitation, a suitable shape may include,but is not limited to, cross-sectional shapes that are circular,elliptical, triangular, rectangular, square, hexagonal, and/orcombinations thereof. In some embodiments, head hole 315 may have acircular cross-section. In certain embodiments, main protrusion 220 maybe disposed through head hole 315. The diameter of head hole 315 may begreater than or equivalent to the diameter of main protrusion 220. Whenmain protrusion 220 is disposed through head hole 315, plunger 145(e.g., referring to FIG. 1A) may be actuated to displace into recess320, thus securing trial head 100 to trial inserter tool 100.

Recess 320 may be an empty space within head body 305. Recess 320 may bedisposed within the thickness of head body 305, and the length of recess320 may run parallel to channel 310. In some embodiments, recess 320 maybe formed at first end 340 of head body 305. Recess 320 may be anysuitable size and/or shape for receiving plunger 145 (e.g., referring toFIG. 1A). Without limitation, a suitable shape may include, but is notlimited to, cross-sectional shapes that are circular, elliptical,triangular, rectangular, square, hexagonal, and/or combinations thereof.In some embodiments, recess 320 may have a circular cross-section. Insome embodiments, recess 320 may generally have the shape of a cylinderwherein one end is open and the other is closed. In certain embodiments,plunger 145 may be displaced into recess 320. The diameter of recess 320may be greater than or equivalent to the shape of plunger 145.

With additional reference to FIGS. 1A, 1B, and 2, once trial head 300 iscoupled to trial inserter tool 100 by disposing main protrusion 220through head hole 315 and displacing plunger 145 into recess 320, trialinserter tool 100 may be used to insert trial head 300 into a patient.For example, trial inserter tool 100 may allow a medical professional toplace trial head 300 through an access channel and into a disc spacebetween a set of vertebral bodies in order to determine the size of asuitable implant that will be disposed between the vertebral bodies. Insome embodiments, marker 325 may be disposed on trial head 300 in orderto determine where trial head 300 is located once within the patient.Marker 325 may be disposed at any suitable location on trial head 300.While only a single marker 325 is shown, there may be a plurality ofmarkers 325 disposed on trial head 300. In some embodiments, marker 325may be radioactive, such that is may be seen using fluoroscopy. Marker325 may be made of any suitable material and may be any suitable size,height, and/or shape. By visual verification of marker 325, a medicalprofessional may be able to correctly position trial head 300 within apatient. As trial head 300 may be coupled to trial inserter tool 100 atsecond end 125, a medical professional may manipulate trial insertertool 100 at first end 120 of trial inserter tool 100 to move trial head300 in a corresponding direction. If necessary, trial head 300 may beremoved from patient and a trial head 300 of a different size may besecured to trial inserter tool 100. The trial head 300 of a differentsize may then be inserted into the patient. This process may berepeated, for example, until the medical professional has determined anappropriate size for the implant.

FIG. 4 illustrates an embodiment of first end 120 of body 105 of trialinserter tool 100. As illustrated, first end 120 may include aninsertion feature 400 and a pin end 405. Insertion feature 400 may serveto be inserted into a handle (as illustrated in FIG. 5) that a medicalprofessional may grip. Insertion feature 400 may be any suitable size,height, and/or shape. As illustrated, insertion feature 400 may includea base 410 and a protruding structure 415. In some embodiments, base 410may be disposed adjacent to protruding structure 415. Withoutlimitation, base 410 may have a square cross-sectional shape, andprotruding structure 415 may have a hexagonal cross-sectional shape. Asshown, pin end 405 may extend from an end of protruding structure 415that opposes base 410.

In some embodiments, pin end 405 may serve as a fastening mechanism tocouple first end 120 of body 105 to a handle. Pin end 405 may be anysuitable size, height, and/or shape. In some embodiments, any othersuitable technique used to fasten may be used. First end 120 may besecured to a handle through the use of suitable fasteners, threading,adhesives, welding, and/or combinations thereof. Without limitation,suitable fasteners may include nuts and bolts, washers, screws, pins,sockets, rods and studs, hinges and/or any combination thereof.

FIG. 5 illustrates an embodiment of a handle 500. Handle 500 may begripped by a medical professional in order to operate trial insertertool 100 (e.g., referring to FIG. 1). In the illustrated embodiment,handle 500 may include of a handle body 505, one or more arms 510, and ahandle recess 515. Handle body 505 may be the main area of handle 500,for example, wherein the palm of a medical professional may be locatedwhen gripping handle 500. Handle body 505 may be made of any suitablematerial. Without limitation, suitable material may be metals,nonmetals, polymers, composites, ceramics, and/or combinations thereof.Handle body 505 may be any suitable size, height, and/or shape. Withoutlimitation, a suitable shape may include, but is not limited to,cross-sectional shapes that are circular, elliptical, triangular,rectangular, square, hexagonal, and/or combinations thereof. Inembodiments, handle body 505 may be T-shaped, wherein arms 510 extendsoutwards from handle body 505 to form the T-shape.

As illustrated, there may be two arms 510 extending outwards indifferent directions from handle body 505. Each arm 510 may include aplurality of arm grooves 520 disposed on each arm 510. In someembodiments, the plurality of arm grooves 520 may be shallow areas wherematerial has been machined out of the arm 510 wherein the fingers of anoperator may rest. In alternate embodiments, the plurality of armgrooves 520 may be deep areas wherein more material has been machinedout of each arm 510. Without limitations, the plurality of arm grooves520 may generally be semi-circular.

In some embodiments, an operator may manually grip both handle 500 andtrial inserter tool 100 (e.g., referring to FIG. 1) and couple themtogether. The operator may insert first end 120 (e.g., referring toFIG. 1) of trial inserter tool 100 into handle recess 515. Handle recess515 may be an empty space within handle body 505. The length of handlerecess 515 may run perpendicular to the lengths arms 510. Inembodiments, handle recess 515 may be accessible by a handle opening 525disposed in handle body 505. Handle recess 515 may be any suitable sizeand/or shape. Without limitation, a suitable shape may include, but isnot limited to, cross-sectional shapes that are circular, elliptical,triangular, rectangular, square, hexagonal, and/or combinations thereof.In some embodiments, handle recess 515 may have a hexagonalcross-section. Further, an end opposite of handle opening 525 may beclosed off. Handle recess 515 may generally have the shape of ahexagonal cylinder wherein one end is open and the other is closed. Incertain embodiments, insertion feature 400 (e.g., referring to FIG. 4)and pin end 405 (e.g., referring to FIG. 4) may be displaced into handlerecess 515 through handle opening 525. In those embodiments, the shapeand size of handle recess 515 may be equivalent to the shape ofprotruding structure 415 (e.g., referring to FIG. 4). Protrudingstructure 415 may displace through handle recess 515 until base 410(e.g., referring to FIG. 4) seats against handle 500. As base 410 seatsagainst handle 500, pin end 405 may engage with handle recess 515 andlock handle 500 to trial inserter tool 100.

The invention being thus described, it will be obvious that the same maybe varied in many ways. Such variations are not to be regarded as adeparture from the spirit and scope of the invention, and all suchmodifications as would be obvious to one skilled in the art are intendedto be included within the scope of the following claims.

What is claimed is:
 1. A system for sizing an implant, comprising: atrial inserter tool, wherein the trial inserter tool comprises: a body,wherein the body is elongated, wherein the body comprises a first endand a second end; an actuation device, wherein the actuation device isdisposed on the body between the first end and the second end; and ahooked support member that extends from the second end of the body; anda trial head releasably attachable to the hooked support member.
 2. Thesystem of claim 1, further comprising a plunger disposed in the body,wherein the plunger is operable to translate axially in the body inresponse to the actuation device.
 3. The system of claim 2, wherein thetrial inserter tool has a retracted position with the plunger retractedinto the body, and wherein the trial inserter tool has an extendedposition with a distal end of the plunger extending from the second endof the body and into a recess into the trial head to lock the trial headonto the trial inserter tool.
 4. The system of claim 2, wherein theactuation device is coupled to the plunger through a hole in the body,wherein the actuation device and the plunger translate together, whereintranslation of the actuation device and the plunger is limited by lengthof the hole.
 5. The system of claim 1, wherein the actuation devicecomprises a sleeve and a button, wherein the button is disposed on thesleeve, wherein the sleeve is disposed around the body of the trialinserter tool.
 6. The system of claim 1, wherein the second endcomprises a plurality of spaced ridges.
 7. The system of claim 1,wherein the hooked support member comprises an end extension and a mainprotrusion, wherein the end extension extends from the second end of thebody, wherein the main protrusion protrudes from the end extensiontowards a central axis of the trial inserter tool.
 8. The system ofclaim 7, wherein the main protrusion is disposed at a distal end of theend extension and is received into a hole in the trial head.
 9. Thesystem of claim 1, wherein the first end comprises an insertion featureand a pin end, wherein the insertion feature comprises a base and aprotruding structure, wherein the protruding structure is hexagonal incross-section.
 10. The system of claim 9, further comprising a handle,wherein the protruding feature is disposable into the handle, whereinthe base abuts the handle, wherein the pin end is engageable with arecess within the handle to couple the handle to the trial insertertool.
 11. The system of claim 10, wherein the handle comprises a handlebody and two arms extending outwards from the handle body.
 12. Thesystem of claim 1, wherein the trial head comprises a head body, achannel disposed in an outer surface of the head body and extendinglongitudinally from a first end of the head body, a head hole disposedin the channel at an end of the channel opposite the first end, a recessdisposed in the first end, and a marker disposed in the head body,wherein the marker is radioactive.
 13. A system for sizing an implant,comprising: a trial inserter tool, wherein the trial inserter toolcomprises: a body, wherein the body is an elongated tubular, wherein thebody comprises a first end and a second end, wherein a hole is disposedin the body between the first end and the second end; a plunger disposedin the body, wherein the plunger is axially translatable in the bodyfrom a retracted position to an extended position with a distal end ofthe plunger extending from the second end of the body; an actuationdevice coupled to the plunger and operable to move the plunger from theextended position to the retraced position, wherein the actuation devicecomprises a sleeve and a button, wherein the sleeve is disposed aroundthe body and positioned between the first end and the second end at thehole, wherein the sleeve is axially displaced in response to actuationof the button, wherein axial displacement of the sleeve is limited bythe hole in the body is actuable to release an axis of motion for thesleeve; and a hooked support member that extends from the second end ofthe body, wherein the hooked support member comprises an end extensionthat longitudinally extends from the second of the body and a mainprotrusion that protrudes from a distal end of the end extension towardsa central axis of the trial inserter tool; and a trial head releasablyattachable to the hooked support member, wherein the trial headcomprises: a head body; a channel for receiving the end extension,wherein channel is formed in an outer surface of the head body andextends longitudinally from a first end of the head body; a head holefor receiving the main protrusion and disposed in the channel at an endof the channel opposite the first end; a recess disposed in the firstend for receiving the plunger in the extended position to lock the trialhead onto the trial inserter tool; and a marker disposed in the headbody, wherein the marker is radioactive.
 14. A trial inserter tool,comprising: a body, wherein the body is elongated, wherein the bodycomprises a first end and a second end; an actuation device, wherein theactuation device is disposed on the body between the first end and thesecond end; a plunger, wherein the plunger is disposed within the body;and a hooked support member, wherein the hooked support member isdisposed at the second end, wherein the hooked support member isoperable to support a trial head on the trial inserter tool.
 15. Thetrial inserter tool of claim 14, wherein the plunger is operable totranslate axially in the body in response to the actuation device from aretracted position to an extended position in which a distal end of theplunger extends from the second end of the body for receiving the trialhead.
 16. The trial inserter tool of claim 14, wherein the actuationdevice is coupled to the plunger such that the actuation device and theplunger translate together, wherein translation of the actuation deviceand the plunger is limited by length of a hole disposed in the body,wherein the actuation device comprises a sleeve and a button, whereinthe button is disposed on the sleeve, wherein the sleeve is disposedaround the body of the trial inserter tool.
 17. The trial inserter toolof claim 14, wherein the second end comprises a plurality of spacedridges.
 18. The trial inserter tool of claim 14, wherein the hookedsupport end comprises an end extension that extends from the second endof the body and a main protrusion that protrudes from a distal end ofthe end extension towards a central axis of the trial inserter tool. 19.The trial inserter tool of claim 14, further comprising a handledisposed on the first end of the trial inserter, wherein the first endcomprises an insertion feature and a pin end, wherein the insertionfeature comprises a base and a protruding structure, wherein theprotruding structure is disposed into the handle, wherein the base abutsthe handle, wherein the pin end engages with a recess within the handleto couple the handle to the trial inserter tool.
 20. The trial insertertool of claim 19, wherein the handle comprises a handle body and twoarms extending outwards from the handle body.